Our final main event for MAKEcation 2009 is our “Family Challenge,” as in the Hatfields vs. the McCoys, the Lancasters vs. the Yorks, the Macs vs. the PCs. Build a backyard trebuchet! The family that builds our favorite, and sends us the documentation, will get a $100 gift certificate from the Maker Shed. Five runners up will get a Maker’s Notebook and their choice of The Best of MAKE or The Best of Instructables.